Sound won't play on YouTube and other flash web based videos on my MAC OSX 10.5.8 So I installed the most recent version of Adobe Flash Player and it still doesn't work. I uninstalled and reinstalled adobe flash player. Nada. I updated my computer software and firmware. Still nothing. I checked my sound and apple movie trailers play just fine. Please assist.

Thanks so much!!!!

Oh, I have tried to play videos in both Safari and Firefox. No sound in both.